CA1282615C - V belt with blocks - Google Patents
V belt with blocksInfo
- Publication number
- CA1282615C CA1282615C CA000545548A CA545548A CA1282615C CA 1282615 C CA1282615 C CA 1282615C CA 000545548 A CA000545548 A CA 000545548A CA 545548 A CA545548 A CA 545548A CA 1282615 C CA1282615 C CA 1282615C
- Authority
- CA
- Canada
- Prior art keywords
- block
- belt
- load
- center
- blocks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
- F16G5/166—V-belts, i.e. belts of tapered cross-section consisting of several parts with non-metallic rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
- F16H2061/66295—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Pulleys (AREA)
Abstract
Abstract A V belt for high load transmission has at least one endless load carrier and a plurality of blocks engaged with the load carrier in the lengthwise direction of belt. The center of gravity of each block is situated near the tensile members of the load carrier. During straight running each block is so supported that it is substantially perpendicular to the load carrier. Also, each block has a surface of arcuate shape at least as a part of its side surfaces.
Description
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V belt with blocks This invention relates to a V belt for transmitting a high load. The belt comprises endless load carriers and a plurality of blocks engaged with each of said load S carriers.
A V belt according to the present invention is usable not only for a continuously variable transmission for motor vehicles but also for a continuously variable or non-continuously variable transmission for other powered vehicles, such as agricultural machines and civil engineer-ing machines. It is also sui~able ~or high load trans-mission for general industrial machines driven by electric motors.
For a motor vehicle, a combine, a tractor or the like, lS a gear type o transmission or an oil pressure type of transmission is usually used. However, ~or improving workability, saving fuel expenses, etc., the development of a belt type o~ continuously variable transmission is in progress.
~ 20 The belt to be used ~or this type of transmission is '` re~uired~to h~ave a high tor~ue transmitting ability, but the conventional rubber V belt~is not useful for this ~ purpose, because lt~cannot ~ithstand the high lateral pressures, namely, it buckles and deforms.
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Various types of transmission for high loads have been suggested up to now (for example, Japanese Patent Appli-cation Laying Open Gazettes No. 46-4861, No. 55-27595, No.
56-76745, No. 59-77147 and No. 61-206847). The applicants themselves have suggested a V belt of a con.struction in which a plurality of blocks are engaged with an endless load carrier in the lengthwise direction of the belt (U.S.
Patent No. 4,655,732 corresponding to Japanese Patent Application Laying Open Gazette No. 60-49151). The applicants have also filed patent applications for a V belt of a similar type (U.S. Patent Applications No~ 903,346 and No. 34,461).
The conventional block for such a V belt is so shaped that it becomes gradually small in shape toward its lower ~art (in the case where it is composed throughout of material of the same specific gravity), and therefore its center of gravity is usually located above the tensile member. If reinforcing members of different specific gravity are employed, the location of the center of gravity ~0 varies with the reinforcing members. Thus, no consider-ation has previously been given to the location of the center of gravity of the block.
A block whose center of gravity is biassed below the tensile member (toward the center of the pulley) has been disclosed, for example, by Japanese Utility Model ~egistration Application Laying Open Gazettes No.
60-177351/ No. 60-101246, No. 61-73949 and U.S. Patent No.
4,595,385. A block whose center of gravity is biassed above the tensile member is disclosed, for example, by Japanese Patent Application Gazettes No. 57-79347 and No. 57-28815.
To enable the prior art to be described with the aid of diagrams, the figures oE the drawings will Eirst be listed.
Fig, 1 is a side view of a ~ belt according to an embodiment of the present invention;
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Fig. 2 is a cross sectional view, taken along the line II-II in Fig. 1;
Fig. 3 is a perspective view of a differen-t block;
Fig. 4 is a cross sectional view of a block having a reinforcing member;
Figs. 5 and 6 are explanatory drawings of a method of testing;
Fig. 7 is a side view of a main part of a different block, partly in section;
Fig. 8 is a cross sectional view, taken along the line VIII-VIII in Fig. 7;
Fig 9 is a cross sectional view of a further different block;
Fig. 10 is a cross sectional view, taken along the line X-X in Fig. 9;
Figs. 11 and 12 are respectively a front view and a plan view of the block;
Fig. 13 is a drawing, similar to Fig. 12, o~ a different embodiment;
Figs. 14 to 16 are front views of a block of other embodiments;
Figs. 17(a) and 17(b) are drawings showing the relation between the block and the pulley, in a case where the block does not incline to the load carriers;
Figs. 18(a) and 18(b) are drawings, similar to Figs.
17(a) and 17(b), in a case where the upper part of the block inclines to the load carrier of the pulley in the rotational direction;
Fig. 19 is an explanatory drawing of rocking of the block; and Figs. 20(a) and 20(b) are drawings, similar to Figs.
17(a) and 17(b), in a case where the lower part oE the block inclines to the load carrier in the rotational direction of the pulley.
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As shown in Fig. 17(a) and (b), a prior art V belt is so designed that when a block 101 advances into the groove of a pulley 102 and engages surfaces 102a, 102b, no gap is left between side surfaces lOla, lOlb of the block 101 and the groove surfaces 102a, 102b, provided that the block 101 stands perpendicularly in relation to the load carrier (not shown), i.e. vertically. In other words the center line S of the block 101 coincides with the radial direction R of the pulley 102. The line W designates the center line ln of the tensile member of load carrier.
In this V belt, as shown by Fig. 18ta), when the block 101 engages the surfaces 102a, 102b of the pulley 102, if the upper part of the block 101 becomes inclined in the rotational direction T of the pulley, the surfaces 102a, 102b assume a hyperbolic shape in a cross section through the center lines. As a result, onl~ the upper portion of the block 101 makes contact ak Pl with the surfaces 102a, 102b, as shown in Fig. 18(b). This in turn causes rocking of the block 101 about the areas Pl as a fulcrum.
Referring to Fig. 19, if a comparison is made between the case where the rocking point a is above the groove lOlc in which the load carrier of the block 101 is fitted while the center line of the block 101 coincides with the radial direction R of the pulley 102 with the point a fixed on the groove surfaces 102a, lO~b (chain lines in Fig. 19) and the case where the center line of the block 101 is inclined at an angle ~ to the radial direction R, it is found that in the latter case the groove lOlc is situated further away from the center 0 of pulley rotation.
Accordingly the block 101 is moved towards the position where it stands perpendicularly on the pulley due to a force F provided by the load carrier that extends around the pulley 102.
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,~, On the other hand, as shown by Fig. 20(~), if the lower part of the block 101 is inclined in the rotational direction T when the block 101 engages the surfaces 102a, 1~2b the cross section at the center line of the block shown in Fig. 20(b~ indicates that surfaces 102, 102b have a hyperbolic shape and also form a small pulley angle in relation to the block angle. Therefore, similarly to the above-~entioned case, when the block 101 engages the surfaces of the pulley 102, only the upper portion of the ~ block makes contact at P2 with the surfaces 102a, 102b and rocking of the block 101 is caused with the contact areas P2 as the fulcrum.
Rocking of the block 101 generates friction where the block ]01 engages the load carrier, this friction involving the generation of heat with a resultant temperature rise of the block and the load carrier. This effect causes ageing of the rubber of which the load carrier is made. The load carrier may crack and the risk of breakage is increased.
Also, since only the upper portion of the block makes contact with the pulley surfaces, the lateral pressure that should be received by the whole of the block side surface is concentrated on the upper portion of the block. This can cause chipping or other damage to the blocks. It is therefore desirable to engage the block with the pulley~
with the block center line coinciding with the pulley radial direction.
With the above in view, the present invention has for its object to provide a V belt that is free from such rocking of the blocks when the belt engages the pulley.
To this end the invention, in one aspect consists of a V bel~ for high load transmission comprising: a plurality of blocks; and endless load carriers, wherein said blocks are engaged with said endless load carriers having tensile members in a lengthwise direction along said belt, and wherein at least a part of a cross-section of a side ~ A
surEace of each block is subs~antially formed ~n an arcuate shape, wherein the center of gravity of said blocks is substantially close to said tensile members oE said load carriers, and said blocks are in a substantially perpe~dic-ular state in relation to the load carriers during straight runnin~.
In another aspect, the inven-tion consists of a V belt for high load transmission comprising at least one endless load carrier having tensile members and a plurality of blocks engayed with said load carrier in the lengthwise direction of said belt, each said block includ~s a groove at least partly defined by upper and lower parts of said block, said load carrier is fitted in said groove in engagement with said upper part of said block, and the center of gravity of each said block is located centrally of said block and within the range of a diameter of a tensile member of said load carrier.
Preferred embodimen~s of the present invention will now be described with reference to the accompanying drawings.
As shown in Figs. 1 and 2, a V belt 1 comprises a pair of load carriers 2, 3 and a plurality of blocks 4 engaged with said load carriers in the lengthwise direction thereof. Grooves 5, 6 are formed in sides 4a, 4b of the blocks 4 in which grooves the load carriers are detachably fitted. A convexly curved part 7 is provided at the upper surEace of each groove 5, 6 and the under surEace is also a curved convex surface 8, the block 4 comprising an upper part 4c, a lower part 4d and a center pillar 4e that connects the upper and lower parts and extends in the vertical direction.
The load carrier 2, 3 has a rubber member 9 and tensile members 10 embedded in the rubber. Where necessary, canvas is provided at the upper and the lower surfaces of the member 9. At the upper and the lower surfaces of the load . ~
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, _ 7 _ carriers 2, 3 are concavely curved parts 11, 12 which engage with the convexly curved parts of the grooves 5~ 6 of the block 4. ~he convexly curved parts 7 and convex surface 8 engage the concave parts 11, 12. Thus, the load carriers 2, 3 and the blocks 4 are fixed together in the lengthwise direction of the belt by the engagement of these convex and concave parts.
When the block of the V belt is composed of material of the same specific gravity throughout, the upper part of the block is larger than the lower part and therefore the center of gravity of the block is situated above the tensile members. With this in view, in this embodiment a part of the upper and the lower parts of the block 4 is cut off to adjust the location of the center of gravity.
By this adjustment during engagement of the block with the load carriers 2, 3 the center of gravity is situated near the tensile members 10 and accordingly the center line of the block 4 is supported perpendicularly in relation to the load carrier 3 (tensile members 10) when in the straight running state. As shown in Fig. 3, the location of the center of gravity can be adjusted by providing concave parts 14d in the upper part 14a of the block 14 and by varying the volume of the cut-out forming the concave parts 14d. If a concave part is provided in the lower part 14c for the purpose of making the block lighter in weight, the location of the center of gravity can be adiusted by varying the volume of the concave parts of both the upper and the lower parts 14a, 14c.
Thus, the location of the center of ~ravity can be adjusted by a partial cut out of the block, e.g. the formation of concave parts. In addition, ad~ustment of the location of the center of gravity can be achieved by making the volume of the part of the block above the tensile members smaller by reducing the height of the upper part or by making the volume of the part of the block below the tensile members larger by increasing the height of -the lower part of the block.
If a reinEorcing member 16 made of a metallic or other material having a higher specific strength than the resin material comprising the main part o~ the block and also a larger specific gravity is embedded in a block 15 ~Fig. 4), the loca~ion of the center of gravity can be adjusted by weight control, such as by decreasing the volume of an upper part 16a of the reinforcing member 16 in an upper part 15a of the block above the tensile members.
Resin materials which constitute the main part of the block are preferably thermoplastic resin, such as 6.6 nylon, aromatic nylon, polyethyleneterephthalate, etc., thermosetting resin~ such as phenol resin, hard poly-urethane, unsaturated polyester, polyimide, epoxi reson, etc., or hard rubber~ such as ebonite. These are used simply or compounded with short fiber, ~illers, a friction regulating agent or the like As to the reinforcing member 16, it is, ~or example, FRP reinforced with a metallic material, long fibers, such as carbon fibers, glass fibers, alumina fibers, aramid fibers or the like.
Location of the center o~ gravity of the block 4 near the tensile members 10 of the load carrier 2, 3 means that the center of gravity of the block 4 is situated within the vertical range of the diameter of the tensile members 10 in the center pillar part 4e of the block.
With this ccnstruction, before the V belt 1 engages a pulley the load carrier 3 extends linearly and the block 4 is substantially perpendicular to the load carrier 3.
Engagement of the block 4 with the pulley is then such that the block 4 engages the pulley with its center line extend-ing in the radial direction o~ the pulley and rocking oE
the block 4 on the pulley does not occur, with the advantages already discussed.
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g The following explains a te.st that was carried out with a V belt according to the presen-t invention.
As shown in Fig. 5, a samp]e bel~ 23 was wound between a driving pulley 21 (pitch diameter 155mm, number of revolutions of the pulley 5,600rpm, axial load D=lOOkgf) and a driven pulley 22 (pitch diameter ~Omm), and was run in the no-load state. The belt temperature was measured by measuring the temperature of the back of the bel~c as it passed around the driven pulley 22 by an infrared radio-thermometer 24. Measuring the belt temperature at this location is most suitable for measuring the temperatue of a running load carrier, because the block on the back side of the belt 23 opens as the belt is bent around the driven pulley 22 and the load carrier becomes easy to observe.
The basic measurements of the block used in this test were, as shown in Fig. 6, ~=26 Ll=40mm and L2=L3=lOmm (Q shows the level of the tensile members of the load carrier). The diameter of the tensile members of the load carrier was 2mm.
The method employed Eor changing the location of the center of gravity of the block was to cut off an upper end portion of the block and to rivet the part below the tensile members or to cut off a lower end portion of the block and to rivet the part above the tensile members.
~o change was made in the total weight of a block. The decrease in weight by cutting off was balanced by the increase in weight by riveting.
The results of the above test are as shown in the following table. As to the location of the center of `~ 30 gravity, it was measured on the basis of the location of `~ the tensile members = O, upper side = positive, and lower side a negative. The temperature rise is the difference between the measured value and room temperature.
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_ , Sample number I 2 ~ 4 5 6 ................................................... ............ ,.... ............ .............. ............ ............
Situation of the -0.77 -0.23 0 0.2 0.5 1.0 center of gravity (mm) Temperature rise (C)65.2 60 56.8 61.6 66.9 74.5 Belt life (Hrs) 183 200 200 200 187 91 more more more I
From the above test results, it can be seen that the nearer the center of gravity is to the location of tensile members, the lower the running belt temperature, and when the center of gravity coincides with the tensile members, the running belt temperature is lowest. However, so long as the location of the center of gravity is approximately within the range of the diameter of the tensile members of the load carrier in the vertical direction (2mm), the result is satisfactory from the viewpoint of belt life.
The above embodiment is applied to a V belt with two load carriers, but is also applicable to a V belt with only one load carrier (as disclosed in Japanese Patent Application Laying Open Ga2ettes No. 61-206847 and No.
62-54348), namely, is applicable to a V belt 33 as shown lS in Fig. 7 and Fig. 8. This ~ belt 33 comprises an endless load carrier 31 and a plurality of blocks 32 through which said load carrier 31 passes and is engaged. Each block 32 comprises a substantially U-shaped underside member 32a and an upper member 32b that engages the member 32a.
recessed part 32d formed in the upper member 32b is engaged by a projecting part 32c formed in the member 32a in the A
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belt width direction. Each block 32 is applicable to a belt 33 with its upper surace 32e formed as a convex surface and its under surface 32f formed as a concave surface~
The above embodiment is also applicable to a V belt 47 as shown in Fig. 9 and Fig. 10. This belt comprises an endless load carrier 41 and a plurality of blocks 42.
Each block 42 comprises connected reinforcing members 43, 44, each having a hollow part, slant side parts 45a, 46a and a pair of friction members each having two leg parts 4~b, 45c and 46b, ~6c parallel to each other, the leg part of each friction member being inserted into the hollow part o~ a reinforcing member 43, 44 for contact with each other, the block ~2 and the load carrier ~1 being connected to each other. The belt 33 and the belt 47 can be adjusted so that the location of the center of gravity is near the tensile members by adjusting the volumes of the upper member 32b and the lower member 32a, or b~ adjusting the volumes of the leg parts 45b, 46b and the leg parts 45c, 46c or by adjusting the specific gravity of the reinforcing members.
In any of the above embodiments, it is intended to prolong the life of the belt by supporting each block substantially perpendicularly in relation to the load carrier while in the straight condition and thereby to prevent rocking of the block. ~owever, in view of possible rocking of the block due to misalignment, it is proposed to restrict the lowering of the belt life by the following arrangement.
As shown in Fig. 11~ in a cross section where upper parts 51a, 51b and lower parts 51c, 51d, which are parts of the side surfaces of the block 51, make a right angle with the lengthwise direction of the belt, each corner is formed with a curved surface of radius Rl, R2. Also, as shown in Fig. 12, in a cross section where the block 51 , ~ , is horizontal and paral]el wi~h the center line of the lengthwise direction of the belt, each corner 51e, 51f, 51g, 51h is formed with a curved surface o~ radius R3.
By this formation, even if ~he width of the groove of the pulley on the driving side and on the driven side varies when the speed is changed and misalignment is caused due to shifting of the center line, and the V belt consequently enters the pulley in a slant state, no partial load is applied to the block 51, because the corner paLt with an arcuate shape makes linear contact with a pulley groove surface 102a, 102b.
Instead of the construction shown in Fig. 12, Fig. 13 shows an alternative in which in a cross section where the block 51A is horizontal and parallel with the cen-ter line of the lengthwise direction of belt, the whole of both side surfaces of the block 51A are formed as a curved surface with radius corresponding to the width (upper part Wl, lower part W2) of the block 51A. In this case, even if a compressing action is applied between the side surface (51i, 51j) of the block 51A and the load carrier, sucll compressing action on the block 51 is small and breakage, cracking, etc. of the block can be avoided due to the sliding of the curved surface towards the outside of the block 51.
It is also suggested that, as s~own in ~ig. 14, the whole side surEace of the block is formed as a curved surface by making the portion between the rounded upper corner part 52a, 52b and the rounded lower corner part 52c, 52d into a surface 52e, 52f that curves ~oward the outside of the block 52.
It is further suggested that, as shown in Fig. 15, the surfaces that form the side surfaces of the block 53 comprise a circular arc of radius R4 described at a part 53d at the opposite corner with a center l placed near a part 53a, a circular arc of radius R5 described at a part 53c at -the opposite corner with the center 2 placed near a part 53b, a eircular arc of radius R6 described at the part 53b at the opposite corner with the center 03 placed near the part 53c, and a circular arc of radius R7 described at the part 53a at the opposite corner with the center 0~ placed near the part 53d.
It is still further suggested that, as shown in Fiy.
16, on the supposition that points Pl, P2, P3, P4 ~upper and lower corners) of both side surfaces of the bloek 54 are on the chain line showing the pulley groove surface 102a, 102b, parts 54e, 54d, 54e, 54f are formed by forming side surfaces 54a, 54b of a curved shape by a eireular arc of almost the same radius but whieh is shorter than the length o~ each perpendieular V1, ~2 whieh is drawn from the poin-t P2 of the bloek 54 to the line Pl, P3 and from point Pl to the line P2, P4 respeetivel~. There is a ease where the side surfaee 54a, 54b makes linear eontact with the pulley.
With the above eonstructions, even if the belt enters the pulley in the slanting state, the block will be held in the speeified position or in a slightly sunk state at the worst, because both side surfaees 54a, 54b of the bloek 54 are of eireular are shape in eross seetion. Thus, the applieation of a partial load to the eorner parts 54e, 54d, ~5 54e, 54f with resultant breakage of the bloek 54 ean be avoided.
Furthermore, it is suggested to eombine the shapes of the bloeks shown in Fig. 11, 14, 15 or 16 with that shown in Fig. 12 or 13. By making the whole of the side surfaees of the bloek of eireular arc shape in eross seation, it is possible to reduee the eompressing aetion on the bloek and also to lessen the generation of vibrations. Aeeordingl~, no partial load is applied to the bloek and damage to the bloek ean be still further avoided.
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As the present invention can be embodied in various constructions without departing from its substantial characteristics, the above embodiments have been given solely for explanation purposes and are not of a restrictive nature. Furthermore, as the scope of the present invention is not limited by the foregoiny description, but by the scope of the claims, equivalents to the foregoing constructions are included.
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V belt with blocks This invention relates to a V belt for transmitting a high load. The belt comprises endless load carriers and a plurality of blocks engaged with each of said load S carriers.
A V belt according to the present invention is usable not only for a continuously variable transmission for motor vehicles but also for a continuously variable or non-continuously variable transmission for other powered vehicles, such as agricultural machines and civil engineer-ing machines. It is also sui~able ~or high load trans-mission for general industrial machines driven by electric motors.
For a motor vehicle, a combine, a tractor or the like, lS a gear type o transmission or an oil pressure type of transmission is usually used. However, ~or improving workability, saving fuel expenses, etc., the development of a belt type o~ continuously variable transmission is in progress.
~ 20 The belt to be used ~or this type of transmission is '` re~uired~to h~ave a high tor~ue transmitting ability, but the conventional rubber V belt~is not useful for this ~ purpose, because lt~cannot ~ithstand the high lateral pressures, namely, it buckles and deforms.
``: A
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~` .
.`~
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-- 2 ~
Various types of transmission for high loads have been suggested up to now (for example, Japanese Patent Appli-cation Laying Open Gazettes No. 46-4861, No. 55-27595, No.
56-76745, No. 59-77147 and No. 61-206847). The applicants themselves have suggested a V belt of a con.struction in which a plurality of blocks are engaged with an endless load carrier in the lengthwise direction of the belt (U.S.
Patent No. 4,655,732 corresponding to Japanese Patent Application Laying Open Gazette No. 60-49151). The applicants have also filed patent applications for a V belt of a similar type (U.S. Patent Applications No~ 903,346 and No. 34,461).
The conventional block for such a V belt is so shaped that it becomes gradually small in shape toward its lower ~art (in the case where it is composed throughout of material of the same specific gravity), and therefore its center of gravity is usually located above the tensile member. If reinforcing members of different specific gravity are employed, the location of the center of gravity ~0 varies with the reinforcing members. Thus, no consider-ation has previously been given to the location of the center of gravity of the block.
A block whose center of gravity is biassed below the tensile member (toward the center of the pulley) has been disclosed, for example, by Japanese Utility Model ~egistration Application Laying Open Gazettes No.
60-177351/ No. 60-101246, No. 61-73949 and U.S. Patent No.
4,595,385. A block whose center of gravity is biassed above the tensile member is disclosed, for example, by Japanese Patent Application Gazettes No. 57-79347 and No. 57-28815.
To enable the prior art to be described with the aid of diagrams, the figures oE the drawings will Eirst be listed.
Fig, 1 is a side view of a ~ belt according to an embodiment of the present invention;
X~
Fig. 2 is a cross sectional view, taken along the line II-II in Fig. 1;
Fig. 3 is a perspective view of a differen-t block;
Fig. 4 is a cross sectional view of a block having a reinforcing member;
Figs. 5 and 6 are explanatory drawings of a method of testing;
Fig. 7 is a side view of a main part of a different block, partly in section;
Fig. 8 is a cross sectional view, taken along the line VIII-VIII in Fig. 7;
Fig 9 is a cross sectional view of a further different block;
Fig. 10 is a cross sectional view, taken along the line X-X in Fig. 9;
Figs. 11 and 12 are respectively a front view and a plan view of the block;
Fig. 13 is a drawing, similar to Fig. 12, o~ a different embodiment;
Figs. 14 to 16 are front views of a block of other embodiments;
Figs. 17(a) and 17(b) are drawings showing the relation between the block and the pulley, in a case where the block does not incline to the load carriers;
Figs. 18(a) and 18(b) are drawings, similar to Figs.
17(a) and 17(b), in a case where the upper part of the block inclines to the load carrier of the pulley in the rotational direction;
Fig. 19 is an explanatory drawing of rocking of the block; and Figs. 20(a) and 20(b) are drawings, similar to Figs.
17(a) and 17(b), in a case where the lower part oE the block inclines to the load carrier in the rotational direction of the pulley.
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As shown in Fig. 17(a) and (b), a prior art V belt is so designed that when a block 101 advances into the groove of a pulley 102 and engages surfaces 102a, 102b, no gap is left between side surfaces lOla, lOlb of the block 101 and the groove surfaces 102a, 102b, provided that the block 101 stands perpendicularly in relation to the load carrier (not shown), i.e. vertically. In other words the center line S of the block 101 coincides with the radial direction R of the pulley 102. The line W designates the center line ln of the tensile member of load carrier.
In this V belt, as shown by Fig. 18ta), when the block 101 engages the surfaces 102a, 102b of the pulley 102, if the upper part of the block 101 becomes inclined in the rotational direction T of the pulley, the surfaces 102a, 102b assume a hyperbolic shape in a cross section through the center lines. As a result, onl~ the upper portion of the block 101 makes contact ak Pl with the surfaces 102a, 102b, as shown in Fig. 18(b). This in turn causes rocking of the block 101 about the areas Pl as a fulcrum.
Referring to Fig. 19, if a comparison is made between the case where the rocking point a is above the groove lOlc in which the load carrier of the block 101 is fitted while the center line of the block 101 coincides with the radial direction R of the pulley 102 with the point a fixed on the groove surfaces 102a, lO~b (chain lines in Fig. 19) and the case where the center line of the block 101 is inclined at an angle ~ to the radial direction R, it is found that in the latter case the groove lOlc is situated further away from the center 0 of pulley rotation.
Accordingly the block 101 is moved towards the position where it stands perpendicularly on the pulley due to a force F provided by the load carrier that extends around the pulley 102.
A
,~, On the other hand, as shown by Fig. 20(~), if the lower part of the block 101 is inclined in the rotational direction T when the block 101 engages the surfaces 102a, 1~2b the cross section at the center line of the block shown in Fig. 20(b~ indicates that surfaces 102, 102b have a hyperbolic shape and also form a small pulley angle in relation to the block angle. Therefore, similarly to the above-~entioned case, when the block 101 engages the surfaces of the pulley 102, only the upper portion of the ~ block makes contact at P2 with the surfaces 102a, 102b and rocking of the block 101 is caused with the contact areas P2 as the fulcrum.
Rocking of the block 101 generates friction where the block ]01 engages the load carrier, this friction involving the generation of heat with a resultant temperature rise of the block and the load carrier. This effect causes ageing of the rubber of which the load carrier is made. The load carrier may crack and the risk of breakage is increased.
Also, since only the upper portion of the block makes contact with the pulley surfaces, the lateral pressure that should be received by the whole of the block side surface is concentrated on the upper portion of the block. This can cause chipping or other damage to the blocks. It is therefore desirable to engage the block with the pulley~
with the block center line coinciding with the pulley radial direction.
With the above in view, the present invention has for its object to provide a V belt that is free from such rocking of the blocks when the belt engages the pulley.
To this end the invention, in one aspect consists of a V bel~ for high load transmission comprising: a plurality of blocks; and endless load carriers, wherein said blocks are engaged with said endless load carriers having tensile members in a lengthwise direction along said belt, and wherein at least a part of a cross-section of a side ~ A
surEace of each block is subs~antially formed ~n an arcuate shape, wherein the center of gravity of said blocks is substantially close to said tensile members oE said load carriers, and said blocks are in a substantially perpe~dic-ular state in relation to the load carriers during straight runnin~.
In another aspect, the inven-tion consists of a V belt for high load transmission comprising at least one endless load carrier having tensile members and a plurality of blocks engayed with said load carrier in the lengthwise direction of said belt, each said block includ~s a groove at least partly defined by upper and lower parts of said block, said load carrier is fitted in said groove in engagement with said upper part of said block, and the center of gravity of each said block is located centrally of said block and within the range of a diameter of a tensile member of said load carrier.
Preferred embodimen~s of the present invention will now be described with reference to the accompanying drawings.
As shown in Figs. 1 and 2, a V belt 1 comprises a pair of load carriers 2, 3 and a plurality of blocks 4 engaged with said load carriers in the lengthwise direction thereof. Grooves 5, 6 are formed in sides 4a, 4b of the blocks 4 in which grooves the load carriers are detachably fitted. A convexly curved part 7 is provided at the upper surEace of each groove 5, 6 and the under surEace is also a curved convex surface 8, the block 4 comprising an upper part 4c, a lower part 4d and a center pillar 4e that connects the upper and lower parts and extends in the vertical direction.
The load carrier 2, 3 has a rubber member 9 and tensile members 10 embedded in the rubber. Where necessary, canvas is provided at the upper and the lower surfaces of the member 9. At the upper and the lower surfaces of the load . ~
-` ~
, _ 7 _ carriers 2, 3 are concavely curved parts 11, 12 which engage with the convexly curved parts of the grooves 5~ 6 of the block 4. ~he convexly curved parts 7 and convex surface 8 engage the concave parts 11, 12. Thus, the load carriers 2, 3 and the blocks 4 are fixed together in the lengthwise direction of the belt by the engagement of these convex and concave parts.
When the block of the V belt is composed of material of the same specific gravity throughout, the upper part of the block is larger than the lower part and therefore the center of gravity of the block is situated above the tensile members. With this in view, in this embodiment a part of the upper and the lower parts of the block 4 is cut off to adjust the location of the center of gravity.
By this adjustment during engagement of the block with the load carriers 2, 3 the center of gravity is situated near the tensile members 10 and accordingly the center line of the block 4 is supported perpendicularly in relation to the load carrier 3 (tensile members 10) when in the straight running state. As shown in Fig. 3, the location of the center of gravity can be adjusted by providing concave parts 14d in the upper part 14a of the block 14 and by varying the volume of the cut-out forming the concave parts 14d. If a concave part is provided in the lower part 14c for the purpose of making the block lighter in weight, the location of the center of gravity can be adiusted by varying the volume of the concave parts of both the upper and the lower parts 14a, 14c.
Thus, the location of the center of ~ravity can be adjusted by a partial cut out of the block, e.g. the formation of concave parts. In addition, ad~ustment of the location of the center of gravity can be achieved by making the volume of the part of the block above the tensile members smaller by reducing the height of the upper part or by making the volume of the part of the block below the tensile members larger by increasing the height of -the lower part of the block.
If a reinEorcing member 16 made of a metallic or other material having a higher specific strength than the resin material comprising the main part o~ the block and also a larger specific gravity is embedded in a block 15 ~Fig. 4), the loca~ion of the center of gravity can be adjusted by weight control, such as by decreasing the volume of an upper part 16a of the reinforcing member 16 in an upper part 15a of the block above the tensile members.
Resin materials which constitute the main part of the block are preferably thermoplastic resin, such as 6.6 nylon, aromatic nylon, polyethyleneterephthalate, etc., thermosetting resin~ such as phenol resin, hard poly-urethane, unsaturated polyester, polyimide, epoxi reson, etc., or hard rubber~ such as ebonite. These are used simply or compounded with short fiber, ~illers, a friction regulating agent or the like As to the reinforcing member 16, it is, ~or example, FRP reinforced with a metallic material, long fibers, such as carbon fibers, glass fibers, alumina fibers, aramid fibers or the like.
Location of the center o~ gravity of the block 4 near the tensile members 10 of the load carrier 2, 3 means that the center of gravity of the block 4 is situated within the vertical range of the diameter of the tensile members 10 in the center pillar part 4e of the block.
With this ccnstruction, before the V belt 1 engages a pulley the load carrier 3 extends linearly and the block 4 is substantially perpendicular to the load carrier 3.
Engagement of the block 4 with the pulley is then such that the block 4 engages the pulley with its center line extend-ing in the radial direction o~ the pulley and rocking oE
the block 4 on the pulley does not occur, with the advantages already discussed.
A
.
..~ .
~ ~8;~6~
g The following explains a te.st that was carried out with a V belt according to the presen-t invention.
As shown in Fig. 5, a samp]e bel~ 23 was wound between a driving pulley 21 (pitch diameter 155mm, number of revolutions of the pulley 5,600rpm, axial load D=lOOkgf) and a driven pulley 22 (pitch diameter ~Omm), and was run in the no-load state. The belt temperature was measured by measuring the temperature of the back of the bel~c as it passed around the driven pulley 22 by an infrared radio-thermometer 24. Measuring the belt temperature at this location is most suitable for measuring the temperatue of a running load carrier, because the block on the back side of the belt 23 opens as the belt is bent around the driven pulley 22 and the load carrier becomes easy to observe.
The basic measurements of the block used in this test were, as shown in Fig. 6, ~=26 Ll=40mm and L2=L3=lOmm (Q shows the level of the tensile members of the load carrier). The diameter of the tensile members of the load carrier was 2mm.
The method employed Eor changing the location of the center of gravity of the block was to cut off an upper end portion of the block and to rivet the part below the tensile members or to cut off a lower end portion of the block and to rivet the part above the tensile members.
~o change was made in the total weight of a block. The decrease in weight by cutting off was balanced by the increase in weight by riveting.
The results of the above test are as shown in the following table. As to the location of the center of `~ 30 gravity, it was measured on the basis of the location of `~ the tensile members = O, upper side = positive, and lower side a negative. The temperature rise is the difference between the measured value and room temperature.
.
;' ` A
`-:
'. !~
_ , Sample number I 2 ~ 4 5 6 ................................................... ............ ,.... ............ .............. ............ ............
Situation of the -0.77 -0.23 0 0.2 0.5 1.0 center of gravity (mm) Temperature rise (C)65.2 60 56.8 61.6 66.9 74.5 Belt life (Hrs) 183 200 200 200 187 91 more more more I
From the above test results, it can be seen that the nearer the center of gravity is to the location of tensile members, the lower the running belt temperature, and when the center of gravity coincides with the tensile members, the running belt temperature is lowest. However, so long as the location of the center of gravity is approximately within the range of the diameter of the tensile members of the load carrier in the vertical direction (2mm), the result is satisfactory from the viewpoint of belt life.
The above embodiment is applied to a V belt with two load carriers, but is also applicable to a V belt with only one load carrier (as disclosed in Japanese Patent Application Laying Open Ga2ettes No. 61-206847 and No.
62-54348), namely, is applicable to a V belt 33 as shown lS in Fig. 7 and Fig. 8. This ~ belt 33 comprises an endless load carrier 31 and a plurality of blocks 32 through which said load carrier 31 passes and is engaged. Each block 32 comprises a substantially U-shaped underside member 32a and an upper member 32b that engages the member 32a.
recessed part 32d formed in the upper member 32b is engaged by a projecting part 32c formed in the member 32a in the A
~32~
belt width direction. Each block 32 is applicable to a belt 33 with its upper surace 32e formed as a convex surface and its under surface 32f formed as a concave surface~
The above embodiment is also applicable to a V belt 47 as shown in Fig. 9 and Fig. 10. This belt comprises an endless load carrier 41 and a plurality of blocks 42.
Each block 42 comprises connected reinforcing members 43, 44, each having a hollow part, slant side parts 45a, 46a and a pair of friction members each having two leg parts 4~b, 45c and 46b, ~6c parallel to each other, the leg part of each friction member being inserted into the hollow part o~ a reinforcing member 43, 44 for contact with each other, the block ~2 and the load carrier ~1 being connected to each other. The belt 33 and the belt 47 can be adjusted so that the location of the center of gravity is near the tensile members by adjusting the volumes of the upper member 32b and the lower member 32a, or b~ adjusting the volumes of the leg parts 45b, 46b and the leg parts 45c, 46c or by adjusting the specific gravity of the reinforcing members.
In any of the above embodiments, it is intended to prolong the life of the belt by supporting each block substantially perpendicularly in relation to the load carrier while in the straight condition and thereby to prevent rocking of the block. ~owever, in view of possible rocking of the block due to misalignment, it is proposed to restrict the lowering of the belt life by the following arrangement.
As shown in Fig. 11~ in a cross section where upper parts 51a, 51b and lower parts 51c, 51d, which are parts of the side surfaces of the block 51, make a right angle with the lengthwise direction of the belt, each corner is formed with a curved surface of radius Rl, R2. Also, as shown in Fig. 12, in a cross section where the block 51 , ~ , is horizontal and paral]el wi~h the center line of the lengthwise direction of the belt, each corner 51e, 51f, 51g, 51h is formed with a curved surface o~ radius R3.
By this formation, even if ~he width of the groove of the pulley on the driving side and on the driven side varies when the speed is changed and misalignment is caused due to shifting of the center line, and the V belt consequently enters the pulley in a slant state, no partial load is applied to the block 51, because the corner paLt with an arcuate shape makes linear contact with a pulley groove surface 102a, 102b.
Instead of the construction shown in Fig. 12, Fig. 13 shows an alternative in which in a cross section where the block 51A is horizontal and parallel with the cen-ter line of the lengthwise direction of belt, the whole of both side surfaces of the block 51A are formed as a curved surface with radius corresponding to the width (upper part Wl, lower part W2) of the block 51A. In this case, even if a compressing action is applied between the side surface (51i, 51j) of the block 51A and the load carrier, sucll compressing action on the block 51 is small and breakage, cracking, etc. of the block can be avoided due to the sliding of the curved surface towards the outside of the block 51.
It is also suggested that, as s~own in ~ig. 14, the whole side surEace of the block is formed as a curved surface by making the portion between the rounded upper corner part 52a, 52b and the rounded lower corner part 52c, 52d into a surface 52e, 52f that curves ~oward the outside of the block 52.
It is further suggested that, as shown in Fig. 15, the surfaces that form the side surfaces of the block 53 comprise a circular arc of radius R4 described at a part 53d at the opposite corner with a center l placed near a part 53a, a circular arc of radius R5 described at a part 53c at -the opposite corner with the center 2 placed near a part 53b, a eircular arc of radius R6 described at the part 53b at the opposite corner with the center 03 placed near the part 53c, and a circular arc of radius R7 described at the part 53a at the opposite corner with the center 0~ placed near the part 53d.
It is still further suggested that, as shown in Fiy.
16, on the supposition that points Pl, P2, P3, P4 ~upper and lower corners) of both side surfaces of the bloek 54 are on the chain line showing the pulley groove surface 102a, 102b, parts 54e, 54d, 54e, 54f are formed by forming side surfaces 54a, 54b of a curved shape by a eireular arc of almost the same radius but whieh is shorter than the length o~ each perpendieular V1, ~2 whieh is drawn from the poin-t P2 of the bloek 54 to the line Pl, P3 and from point Pl to the line P2, P4 respeetivel~. There is a ease where the side surfaee 54a, 54b makes linear eontact with the pulley.
With the above eonstructions, even if the belt enters the pulley in the slanting state, the block will be held in the speeified position or in a slightly sunk state at the worst, because both side surfaees 54a, 54b of the bloek 54 are of eireular are shape in eross seetion. Thus, the applieation of a partial load to the eorner parts 54e, 54d, ~5 54e, 54f with resultant breakage of the bloek 54 ean be avoided.
Furthermore, it is suggested to eombine the shapes of the bloeks shown in Fig. 11, 14, 15 or 16 with that shown in Fig. 12 or 13. By making the whole of the side surfaees of the bloek of eireular arc shape in eross seation, it is possible to reduee the eompressing aetion on the bloek and also to lessen the generation of vibrations. Aeeordingl~, no partial load is applied to the bloek and damage to the bloek ean be still further avoided.
x~
As the present invention can be embodied in various constructions without departing from its substantial characteristics, the above embodiments have been given solely for explanation purposes and are not of a restrictive nature. Furthermore, as the scope of the present invention is not limited by the foregoiny description, but by the scope of the claims, equivalents to the foregoing constructions are included.
` .A
. . .
~ .
. :
Claims (13)
1. A V belt for high load transmission comprising at least one endless load carrier having tensile members and a plurality of blocks engaged with said load carrier in the lengthwise direction of said belt, each said block includes a groove at least partly defined by upper and lower parts of said block, said load carrier is fitted in said groove in engagement with said upper part of said block, and the center of gravity of each said block is located centrally of said block and within the range of a diameter of a tensile member of said load carrier.
2. A V belt for high load transmission as defined by claim 1, wherein said groove is open at one side of the block, a plurality of concave surfaces are spaced lengthwise along an upper part of the load carrier, said upper part of each block is formed with a convex part adapted to engage one of said concave surfaces of said load carrier, and each of said blocks are engaged with the load carrier in the lengthwise direction of said belt by engagement of said convex part of said upper part of each block with one of said concave surfaces of said load carrier.
3. A V belt for high load transmission as defined by claim 1, wherein each block has a reinforcing member embedded therein.
4. A V belt for high load transmission as defined by claim 2, wherein said upper and lower parts of each block comprise an upper beam part and a lower beam part respectively and further including a center pillar part connecting the central parts of said upper and lower beam parts, a pair of grooves are formed by space encircled by said both beam parts and the center pillar part, each of said blocks is engaged with a pair of endless load carriers with each of said load carriers in one of said grooves and the center of gravity of each block is located in said center pillar part of each block.
5. A V belt for high load transmission as defined in claim 1, wherein only one load carrier passes through a plurality of blocks.
6. A V belt for high load transmission comprising a pair of endless load carriers having tensile members and a plurality of blocks with each block having a pair of grooves in which said load carriers are detachably fitted in the width direction of each block, said load carriers having an upper part and said grooves being at least partly defined by an upper surface, a concaved part is formed at the upper part of the load carrier, a convexed part which engages with said concaved part is formed at the upper surface of the grooves of each block, each block is engaged with the load carrier in the lengthwise direction of said belt by engagement of said convexed part with said concaved part, and the center of gravity of each block is located centrally of said block and near the tensile members of the load carriers.
7. A V belt for high load transmission as defined by claim 6, wherein each block comprises an upper beam part, a lower beam part and a center pillar part connecting the central parts of said upper and lower beam parts, said pair of grooves are formed in each block by space encircled by said both beam parts and the center pillar part and the center of gravity of each block is located within the range of a diameter of the tensile members of the load carriers.
8. A V belt for high load transmission comprising:
a plurality of blocks; and endless load carriers, wherein said blocks are engaged with said endless load carriers having tensile members in a lengthwise direction along said belt, and wherein at least a part of a cross-section of a side surface of each block is substantially formed in an arcuate shape, wherein the center of gravity of said blocks is substantially close to said tensile members of said load carriers, and said blocks are in a substantially perpendic-ular state in relation to the load carriers during straight running.
a plurality of blocks; and endless load carriers, wherein said blocks are engaged with said endless load carriers having tensile members in a lengthwise direction along said belt, and wherein at least a part of a cross-section of a side surface of each block is substantially formed in an arcuate shape, wherein the center of gravity of said blocks is substantially close to said tensile members of said load carriers, and said blocks are in a substantially perpendic-ular state in relation to the load carriers during straight running.
9. A V belt for high load transmission as defined by claim 8, wherein the surface of arcuate shape in cross section at the side surface of the block is a roundness formed at corner parts of the upper and lower parts of each block in the cross section where it crosses at a right angle a center line of a lengthwise direction of the belt.
10. A V belt for high load transmission as defined by claim 8, wherein the surface of arcuate shape in cross section at the side surface of each block is a circular arc formed to extend over the whole of the upper and the lower parts of the block in the cross section where it crosses at a right angle a center line of a lengthwise direction of the belt.
11. A V belt for high load transmission as defined by claim 9, wherein the part between the roundnesses at the corner parts curves towards the outside of the block and is a curved surface connecting to said roundness in the cross section where it crosses at a right angle a center line of a lengthwise direction of the belt.
12. A V belt for high load transmission as defined by claim 9, wherein the corner parts at the upper part and the lower part of the block have a roundness in a cross section where it is horizontal and is in parallel with a center line of a lengthwise direction of the belt.
13. A V belt for high load transmission as defined by claim 8, wherein the surface of arcuate shape in cross section at the side surface of the block is a curved surface of a radius corresponding to a width of the block in a cross section where it is horizontal and is in parallel with a center line of a lengthwise direction of belt.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-132455 | 1986-08-28 | ||
| JP1986132455U JPH037632Y2 (en) | 1986-08-28 | 1986-08-28 | |
| JP1986150844U JPH0326342Y2 (en) | 1986-09-30 | 1986-09-30 | |
| JP61-150844 | 1986-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1282615C true CA1282615C (en) | 1991-04-09 |
Family
ID=26467027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000545548A Expired - Fee Related CA1282615C (en) | 1986-08-28 | 1987-08-27 | V belt with blocks |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US4813920A (en) |
| EP (1) | EP0257646B1 (en) |
| CA (1) | CA1282615C (en) |
| DE (1) | DE3776462D1 (en) |
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| NL8900072A (en) * | 1989-01-12 | 1990-08-01 | Doornes Transmissie Bv | CROSS-ELEMENT FOR A BELT. |
| US5242332A (en) * | 1990-04-02 | 1993-09-07 | Caoutchouc Manufacture Et Plastiques S.A. | Transmission arrangement with a covered transmission belt |
| FR2660389B1 (en) * | 1990-04-02 | 1992-06-05 | Caoutchouc Manuf Plastique | FLEXIBLE LINK OF POWER TRANSMISSION, WITH A TRAPEZOUIDAL CORE AND PUSHING LINKS COVERED WITH FABRIC. |
| JP2529017B2 (en) * | 1990-07-25 | 1996-08-28 | 日産自動車株式会社 | Transmission belt |
| US5318484A (en) * | 1992-06-01 | 1994-06-07 | Forster Lloyd M | Metal V-belt drive |
| US5692984A (en) * | 1994-12-09 | 1997-12-02 | Sr Engineering Company Limited | Flexible drive member for pulling and pushing and fluid-operated moving apparatus |
| JP2857083B2 (en) * | 1995-07-13 | 1999-02-10 | バンドー化学株式会社 | V belt for high load transmission |
| JPH11351335A (en) * | 1998-04-10 | 1999-12-24 | Honda Motor Co Ltd | Continuously variable transmission belt |
| JP2000346140A (en) * | 1999-06-04 | 2000-12-12 | Honda Motor Co Ltd | Belt for continuously variable transmission |
| DE60005746T2 (en) * | 1999-06-18 | 2004-04-29 | Honda Giken Kogyo K.K. | Belt for continuously variable transmission |
| ATE347060T1 (en) | 2000-05-09 | 2006-12-15 | Gates Corp | BELT WITH BLOCKS FOR A CONTINUOUSLY VARIABLE TRANSMISSION |
| MY130416A (en) * | 2000-10-27 | 2007-06-29 | Yamaha Motor Co Ltd | Vehicle automatic transmission |
| DE10057382A1 (en) * | 2000-11-18 | 2002-05-23 | Contitech Antriebssysteme Gmbh | Hybrid V-belt has trapezoid-sectioned support elements, tension support and ties |
| US7070529B2 (en) * | 2001-05-30 | 2006-07-04 | Mitsuboshi Belting Ltd. | Power transmission belt |
| EP1498642B1 (en) * | 2002-04-08 | 2009-07-29 | Yamaha Hatsudoki Kabushiki Kaisha | Engine |
| JP3780237B2 (en) * | 2002-08-19 | 2006-05-31 | バンドー化学株式会社 | V belt for high load transmission |
| DE10350875A1 (en) | 2003-10-31 | 2005-06-02 | Contitech Antriebssysteme Gmbh | High-hybrid V-belt arrangement |
| JP4822750B2 (en) * | 2004-08-06 | 2011-11-24 | ヤマハ発動機株式会社 | V-belt, belt-type transmission and straddle-type vehicle |
| WO2007055560A1 (en) * | 2005-11-08 | 2007-05-18 | Robert Bosch Gmbh | Transmission with pulleys and a drive belt |
| DE102005062260A1 (en) | 2005-12-24 | 2007-07-05 | Contitech Antriebssysteme Gmbh | Hybrid belt for continuously variable transmission has elasticity in range 5,000 to 10,000 N/mm(2 |
| US20070298921A1 (en) * | 2006-06-02 | 2007-12-27 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Plate-link chain and rocker member for a belt-driven conical-pulley transmission |
| DE102007024940A1 (en) | 2007-05-29 | 2008-12-04 | Contitech Antriebssysteme Gmbh | Hybrid V-belt for use in continuous variable transmission, has supporting elements including increased cross-linking degree against initial state after shaping of radiation such as gamma rays, through radiation-crosslinking |
| JP2009041608A (en) * | 2007-08-07 | 2009-02-26 | Bando Chem Ind Ltd | Heavy load transmission v-belt |
| JP2009041609A (en) * | 2007-08-07 | 2009-02-26 | Bando Chem Ind Ltd | V-belt for high load power transmission |
| US20100004084A1 (en) * | 2008-07-01 | 2010-01-07 | Xinjian Fan | Variable speed belt |
| US8206251B2 (en) * | 2009-04-30 | 2012-06-26 | The Gates Corporation | Double cogged V-belt for variable speed drive |
| JP5840293B2 (en) * | 2012-07-06 | 2016-01-06 | 本田技研工業株式会社 | Metal belt element |
| WO2017200047A1 (en) * | 2016-05-20 | 2017-11-23 | バンドー化学株式会社 | Cogged v-belt and transmission system using same |
| JP2019065931A (en) * | 2017-09-29 | 2019-04-25 | トヨタ自動車株式会社 | Transmission belt |
| JP7215887B2 (en) * | 2017-12-07 | 2023-01-31 | 株式会社アイシン | Transmission belt and continuously variable transmission |
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| US3016755A (en) * | 1958-12-20 | 1962-01-16 | Reimers Getriebe Kg | Link chain for infinitely variable pulley gear transmissions |
| DE2242383A1 (en) * | 1972-08-29 | 1974-03-14 | Elsbett | SPIRAL CHANNEL, ESPECIALLY IN THE INTAKE SYSTEM OF RECIPROCATING PISTON INTERNAL ENGINEERING MACHINES |
| NL152969C (en) * | 1973-08-31 | 1983-04-18 | Volvo Car Bv | DRIVING BELT WITH A TRAPEZIUM-SHAPED PROFILE, CONSISTING OF A METAL DRAWBAND AND SLIDABLE METAL CROSS-ELEMENTS. |
| US4177687A (en) * | 1978-08-16 | 1979-12-11 | The Gates Rubber Company | V-belt |
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| JPS5676745A (en) * | 1979-11-28 | 1981-06-24 | Mitsuboshi Belting Ltd | Manufacturing method of cogged belt for power transmission |
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| EP0047585A1 (en) * | 1980-09-08 | 1982-03-17 | The Gates Rubber Company | V-block belt |
| JPS5977147A (en) * | 1982-10-23 | 1984-05-02 | Mitsuboshi Belting Ltd | Belt for transmitting high load |
| FR2540953B1 (en) * | 1983-02-15 | 1988-02-26 | Renault | PUSH LINK BELT RIDER |
| DE3466042D1 (en) * | 1983-07-29 | 1987-10-15 | Bando Chemical Ind | V BELT |
| JPS6049151A (en) * | 1983-07-29 | 1985-03-18 | Bando Chem Ind Ltd | V belt |
| JPS60177351A (en) * | 1984-02-24 | 1985-09-11 | Canon Inc | Electrophotographic sensitive body |
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| JPS6173949A (en) * | 1984-09-20 | 1986-04-16 | Mitsubishi Paper Mills Ltd | Processing solution for silver complex salt diffusion transfer |
| US4622025A (en) * | 1984-10-01 | 1986-11-11 | Borg-Warner Corporation | Chain-belt |
| DE3447092A1 (en) * | 1984-12-22 | 1986-07-03 | P.I.V. Antrieb Werner Reimers GmbH & Co KG, 6380 Bad Homburg | CONTINUOUSLY ADJUSTABLE CONE DISC BELT GEARBOX |
| US4650445A (en) * | 1985-02-20 | 1987-03-17 | Borg-Warner Automotive, Inc. | Chain-belt |
| JPS61206847A (en) * | 1985-03-06 | 1986-09-13 | Bando Chem Ind Ltd | Block v belt |
| JPS6254348A (en) * | 1985-09-03 | 1987-03-10 | Nec Corp | Processing system for fault of file |
| DE3666087D1 (en) * | 1985-09-04 | 1989-11-09 | Bando Chemical Ind | V BELT |
-
1987
- 1987-08-27 CA CA000545548A patent/CA1282615C/en not_active Expired - Fee Related
- 1987-08-27 DE DE8787112481T patent/DE3776462D1/en not_active Expired - Lifetime
- 1987-08-27 US US07/090,064 patent/US4813920A/en not_active Expired - Fee Related
- 1987-08-27 EP EP87112481A patent/EP0257646B1/en not_active Expired - Lifetime
-
1988
- 1988-09-13 US US07/243,747 patent/US4894048A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4894048A (en) | 1990-01-16 |
| EP0257646A2 (en) | 1988-03-02 |
| EP0257646B1 (en) | 1992-01-29 |
| DE3776462D1 (en) | 1992-03-12 |
| EP0257646A3 (en) | 1988-06-29 |
| US4813920A (en) | 1989-03-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |